Help with enclosure design for type X

I have two ALPINE SWX-1242D subs. I need suggestions for building an enclosure for them. I wondered if anyone could help who may already own these subs. The amp is a SoundStream Class D 2000watt RMS amp that puts out its power at 1ohm. Anyone who already has these subs? Or anyone who has built enclosures for these have any ideas?